[Neptune420]

You don't have to have baffles by any means. One of my sump/fuges is nothing but a 20g with a cheap divider to separate the pump and heater. You will need to put a check valve on your return line. This way in case of power failure you wont siphon from your display to your sump and flood. Although, if you are using a continuous siphon overflow it will never be completely flood proof. Once in a great while my overflow will get an air bubble in it and the water will rise, luckily I have caught it everytime so far. A rubber made tub is fine. I would use 6500k pc or t5 lighting, no need for the flood lights.